If isDefault, it will use the default setting from the browser. Else, the getValue return value will be used. getValue is invalid if !isDefault.
If isDefault, it will use the default setting from the browser. Else, the getValue return value will be used. getValue is invalid if !isDefault.
Set it with = true or = false.
And this resets it to the default value.
Represents a browser setting that can be left default or specifically turned on or off.